Apparatus for cutting rubber sheets



July 24,1928. 1,678,036 c. H. DESAUTELS APPARATUS FOR CUTTING RUBBER SHEETS Filed April 19, 1926 2 Sheets-Sheet 1 ATTORNEY. V

July 24, 1928. 1,678,036

I C. H. DESAUTELS APPARATUS FOR CUTTING RUBBER SHEETS Filed April 19, 1926 2 sheets-sheet 2 Patented July 24, 1928 UNITED: STATES.-

MASSACHUSETTS.

CHARLES H. nE'sAu'rnLs. or srniuerintn, MASSACHUSETTS, AssIeNo l'ro THE 1 RUBBER OOMPANYHOF onioornn FALLS, MASSACHUSETTS, a coaroaacp 'onfor APPARATUS roB-oU'r'rINe RUBBER SHEETS.

Application filed April 19, 1926. Serial .No. 102,930.

This invention relates to an apparatus for cutting rubber sheets.- It has particular reference to-=apparatus for trimming the edges of, a continuous rubber sheet as the latter is being delivered upon the surface of a roll, as for example aroll of the calender upon which the stock is being formed. The object of the invention is to provide an apparatus by which such sheets may be cutcleanly and accurately, and without sticking of the marginal portions of theadhesive rubber to the edges ofthe trimmed sheet.

Referring to the drawings.

Fig. 1 is a vertical section through a calender upon which my invention is applied;

Fig. 2 is a top plan view of a cutting device shown in Fig. 1;

Fig. 3 is a perspective view of theparts shown in Fig. 2, looking'fi'om the upper parts shown in Fig. 1;

right hand corner in the latter ligure;

Figs. 4,5, 6 and 7 are detail VIQWSQH an enlarged scale illustrative of theaction of the margin turning apparatus;

Fig. 8 is a front elevation of the calender, looking from the right in Fig. 1; Fig. 9 is an enlarged side elevatlon of the Fig. 10 is an elevation of theparts shown in 9. looking from the right in the latter till figure; and y Figs. 11 and 12 are respectively SlClQ and front elevations ofa modification.

The invention has been shown as applied to a three roll calender adapted in accordance with the Hanna Patent 1,289,744 for the production of two-ply rubber stock. It

is equally applicable, however, to calend'ers of other types, the one chosen being as an illustration only. The calender comprises stacked rolls 15, 16 and'17 supported in a suitable 'frame18 and driven by gearing 19. Feeds of rubber 20 and :21 are sheeted out by the rolls to form webs of rubber 22 and 23 respectively. The web- 22 is guided around rollers :24 to a pressure roller 25 mounted in slides 26 so as to press the web 22 against the web 23 to form a two-ply web 27. In the operation of a calender of this type it is necessary to cut the web 22 and also the web 23 on their respective supporting rollers 15 and 17 so that the compound web may be of the size desired, the two webs being of the same or of difi'erent widths. The usual form of cutting device employed for this purpose is a knife bearing directlyupon the suriiace of the calender roll, the marginal port-ions of the stock passing around the roll as at 28 and 29 to join the sheetof rubber, It has been found that a cut produced this manner will generally not be even on the edges due to there-uniting'of thebody of the sheet with the marginal portions after the cut was made. y I a Y By my invention Ihave produced an ap; paratus by which the marginal portions are removel from possibility of contact with the.

body of the cut web, andhavegalsoimproved l the manner [of mounting the, cutter nemb'ers themselves. Extending across the calender between the end frames 18 are rods j3 0lsup-i porting as many cutting units-as desired. three cutting units are shown upon Y In Fig. a; rod 30 ad'acent the upper roll 15,.and a similar num er are shown on a rodv30 adjacent the lowerroll 17. Allof these units are similar and a description of one will suflice.

Each unit comprises a body portion 31 having a hub 32 clamped by a setjscrew 33. or other suitable. adjustable means to the. rod 30. In the'case showneach' unit carries a pair of later, for movingieither one of the Iknives outof operative position whenlits use. is not side each of the plungers'39 are rodsAO having enlarged heads 41 and held. by springs 42 so as to be constantly strained towards the calender roll. Each rod has a head or 'lrnives v84, the use of a' pair being desirable I in order: to form a pair of webs side by side with a Space betweenthem as shown in Itlig.

8. Provision is nade, as will bedescribed At right angles i handle 43 and an eccentric ledge 44' adapted to fit either into a shoulder 45 or into a notch 16 in the ad acent one of the plunger's 39.

When the ledge is engaged in the shoulder 45 the plow 38 will be forced by the spring 4:2 yieldingly against the surface of roll 17. If the handle 43 is rotated so as to turn the eccentric ledge 44 out of contact with the shoulder, the plungers may be retracted and the ledge then re-engaged with the notch 46 to hold the plow in an inoperative position.

A :siniilai' "me ning is provided iiorlthe. knives 34, plungers 47 being providedwith ledges l8. engaging.either the ends otthe slides. 36hr grooves 011 the "aher 1 surfaces;

5 The grooves do not appear inthedratvings,

being covered by other parts, but are in the I same relative pos1t1on ontheslide notches -46 are'on the plungers 39. This construetion vservesto press-the ilz-nivesfl-or plows I against thecalender roll with an elastic pressin-e but also "provides aniiethod by Winch any individual knitejor' plowinay beheld in an inactive' position by "a very simple rn'ipulationoperation-tlieknife 3 l-severs-the sheet marginal portion adjacent the'cut'. This operation ISQ'ShOW Ii; progressively iii-Figs. l to 7 these. views being longitudinal; sections.

through a portionofthe calenden roll dij1rj ingits fpas sag-e over one of the-folders; A'lte'r the position of F g. 36 has been reached,the elastie nature'fof the rubber will eausethe ina'rginal portion to "turn-coinpletely back oiti itselt "Without the necessity of its being positively forced into this'posi5 tionQAs is 'elearly'seen tro n Figli', the'c'u't. 2.9, edge 51 of the sheet sthus left Eree'flrom' any possibilityoij-contact With the ti'iinnled the s'arne result a di ii'erent arrangement;

. In'this modification (Figs. lland'lil) Icinploy a roll 52 mounted upon a suitable sup port 53 softhat its axis is' atnn'angle' to the aid of the roll 17. t1;find'thatthe' best-Tresults Will be secured roll is trusto-coilica'l. iorin as indicated in Fig-J 1.2-. The roll is set to Contact with the outer sur- "face of the rubber sheet'at thehinarginal glee otthe out made by theknife and lefti'ree'to be rotated by the friction oft-lie stock: Due to the stresses ,set up in theedgcs oil the inarginalportions of the stock by this .9 roll Ihave foundithat thefinarg-inzl portions will turn over as indicated in FI nthe roll 1? and irninediatelythereafter .ui'e'plow 38 enteitsthe insertiontlnis made and turns back upon" itself the edge of the a lying "between the lkniv'es.

.11 and" Batter passing underthese rolls andjwith out the necessity of any plow entering under them.

Having thus describedfmy invention, 1

claim 1. lincoinbiiiation, a iroll for supporting a rubber sheet, means .tor cutting the sheet, and means for turning back upon itself the marginal: portions of the sheet. i

2, Incombinatiom a roll for supporting a rubber sheet means for cutting thev sheet, and an angularly arranged turning device adapted to engage the marginal portionsot the sheet and told it back upon itself;

In combination, aroll tor supporting a rubber -sheet,ua pair of adjacent knives i'or cutting the sheet along l1nes circuinlerentially' ot-the roll, and a pair of turning devices operable to turn; back upon itself the edge portions of the "strip ofrubloer i 4;; In combination, a roll for supporting a rubber.isheet,1ineans'for cutting the sheet along l1nes circuinferentlally of the roll, and a device 'i'rictionally engaging the outer surface of tl'ie niarginal portion of said sheet to cause the edge of this marginal portion to fold over upon itself. v

.5. in combination, a roll tor'supporting a 1 rubber sheet, means, for cutting said sheet along a line c ircumterentially ofthe roll,

and. a frustosconical roll-having its large end frictionally" engaging the stock at a point adjacent the cut end having 'itsaXi's set at an angle to the axis of theroll Whereby a portion ot'the-stock Will be caused to fold "over upon itself leaving one cut edge free of contact with other rubber surfaces. ...:6. Inconibination, a roll for supporting .a rubber sheet and av knife holder comprising; asupportlng shde, spring pressed plungers mounted adjacent the slide, knives carr ed by thesllde, and ineans forcausing "the plunger-s toengage the slide either to press the. knife intoi operative position against the roll or to hold itin. inoperative position. r

HARLES H. nEs aiiTELs.

The action is decidedly peculiar as itapparentlyis in thefexact opposite of the direction of the force exerted by the roll. 

